diff --git a/MainCharacterTag_OC.lua b/MainCharacterTag_OC.lua
index 63c747d..ecbe1de 100644
--- a/MainCharacterTag_OC.lua
+++ b/MainCharacterTag_OC.lua
@@ -44,17 +44,22 @@ function SendChatMessage(msg, chatType, language, channel)
 end
 
 -- ============================================================
--- Filter achievement messages from guild and officer chat
+-- Filter achievement and Shellcoin messages
 -- Hooks ChatFrame_OnEvent, the correct approach for 1.12.1
 -- ============================================================
 local origChatFrameOnEvent = ChatFrame_OnEvent
 
 function ChatFrame_OnEvent(event)
-    if (event == "CHAT_MSG_GUILD" or event == "CHAT_MSG_OFFICER") then
+    if event == "CHAT_MSG_GUILD" or event == "CHAT_MSG_OFFICER" then
         if MainCharacterTag_OCDB.filterAchievements and arg1 and string.find(string.lower(arg1), "has earned the achievement") then
             return
         end
     end
+    if event == "CHAT_MSG_SYSTEM" then
+        if MainCharacterTag_OCDB.filterShellcoin and arg1 and string.sub(arg1, 1, 15) == "Shellcoin price" then
+            return
+        end
+    end
     origChatFrameOnEvent(event)
 end
 
@@ -63,7 +68,7 @@ end
 -- ============================================================
 local optionsFrame = CreateFrame("Frame", "MainCharacterTag_OCOptions", UIParent)
 optionsFrame:SetWidth(360)
-optionsFrame:SetHeight(240)
+optionsFrame:SetHeight(280)
 optionsFrame:SetPoint("CENTER", UIParent, "CENTER")
 optionsFrame:SetBackdrop({
     bgFile   = "Interface\\DialogFrame\\UI-DialogBox-Background",
@@ -132,6 +137,20 @@ achieveCheck:SetScript("OnClick", function()
     MainCharacterTag_OCDB.filterAchievements = achieveCheck:GetChecked() and true or false
 end)
 
+-- Shellcoin filter checkbox
+local shellcoinCheck = CreateFrame("CheckButton", "MainCharacterTag_OCShellcoinCheck", optionsFrame, "UICheckButtonTemplate")
+shellcoinCheck:SetPoint("TOPLEFT", optionsFrame, "TOPLEFT", 16, -162)
+shellcoinCheck:SetWidth(24)
+shellcoinCheck:SetHeight(24)
+
+local shellcoinLabel = optionsFrame:CreateFontString(nil, "OVERLAY", "GameFontHighlightSmall")
+shellcoinLabel:SetPoint("LEFT", shellcoinCheck, "RIGHT", 4, 0)
+shellcoinLabel:SetText("Hide 'Shellcoin price' system messages")
+
+shellcoinCheck:SetScript("OnClick", function()
+    MainCharacterTag_OCDB.filterShellcoin = shellcoinCheck:GetChecked() and true or false
+end)
+
 -- Status text centered above buttons
 local statusLabel = optionsFrame:CreateFontString(nil, "OVERLAY", "GameFontHighlightSmall")
 statusLabel:SetPoint("BOTTOM", optionsFrame, "BOTTOM", 0, 50)
@@ -169,6 +188,7 @@ optionsFrame:SetScript("OnShow", function()
     nameInput:SetText(GetMainName())
     currentLabel:SetText("Logged in as: |cffffd700" .. (UnitName("player") or "Unknown") .. "|r")
     achieveCheck:SetChecked(MainCharacterTag_OCDB.filterAchievements and true or false)
+    shellcoinCheck:SetChecked(MainCharacterTag_OCDB.filterShellcoin and true or false)
     local main = GetMainName()
     if main == "" then
         statusLabel:SetText("|cffaaaaaa(No main set — prefix disabled)|r")
@@ -204,6 +224,9 @@ eventFrame:SetScript("OnEvent", function()
         if MainCharacterTag_OCDB.filterAchievements == nil then
             MainCharacterTag_OCDB.filterAchievements = false
         end
+        if MainCharacterTag_OCDB.filterShellcoin == nil then
+            MainCharacterTag_OCDB.filterShellcoin = false
+        end
         DEFAULT_CHAT_FRAME:AddMessage("|cff00ff96MainCharacterTag_OC|r loaded. Type |cffffd700/mct|r to open options.")
     elseif event == "PLAYER_ENTERING_WORLD" then
         playerReady = true
diff --git a/MainCharacterTag_OC.toc b/MainCharacterTag_OC.toc
index 224fe5f..45e1d2e 100644
--- a/MainCharacterTag_OC.toc
+++ b/MainCharacterTag_OC.toc
@@ -1,7 +1,7 @@
 ## Interface: 11200
 ## Title: MainCharacterTag_OC
 ## Notes: Prefixes guild chat messages with your main character's name so guildies know who you are.
-## Version: 1.5
+## Version: 1.7
 ## Author: Olzon
 ## SavedVariables: MainCharacterTag_OCDB
 
diff --git a/README.md b/README.md
index 71caea6..48849d1 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # MainCharacterTag_OC
 
-![Version](https://img.shields.io/badge/version-1.5-blue) ![Interface](https://img.shields.io/badge/OctoWoW_1.18-1.12.1-yellow)
+![Version](https://img.shields.io/badge/version-1.7-blue) ![Interface](https://img.shields.io/badge/OctoWoW_1.18-1.12.1-yellow)
 
 A lightweight World of Warcraft addon for OctoWoW (1.18) or other 1.12.1 WoW clients that automatically tags your guild chat messages with your main character's name when playing on alts.
 
@@ -9,7 +9,7 @@ A lightweight World of Warcraft addon for OctoWoW (1.18) or other 1.12.1 WoW cli
 When you chat in **Guild** or **Guild Officer** chat on an alt, your messages are automatically prefixed with your main's name so guildmates always know who they're talking to.
 
 **Example:** Playing on your alt `Shadowpoke` with main set to `Thunderbash`:
-> **(Thunderbash): Hey all, it's me just on my alt!**
+> **Shadowpoke (Thunderbash): Hey all, it's me just on my alt!**
 
 Messages sent from your main character are unaffected.
 
@@ -42,12 +42,19 @@ Enter your main character's name and click **Save**. That's it.
 - Only affects **Guild** (`/g`) and **Guild Officer** (`/o`) chat
 - Messages starting with `.`, `/`, or `#` are never prefixed
 - Achievement spam filter is off by default and can be toggled in the options window
+- Shellcoin price system message filter is off by default and can be toggled in the options window
 - Your main's name is saved between sessions per character
 - Works on any number of alts
 - No performance impact — only runs when you send a guild message
 
 ## Changelog
 
+### 1.7
+- Changed Shellcoin filter to match messages starting with `Shellcoin price` instead of `Shellcoin`
+
+### 1.6
+- Added checkbox to hide `Shellcoin price` system messages (default: off)
+
 ### 1.5
 - Added checkbox in options to toggle filtering of `has earned the achievement` messages in guild and officer chat (default: off)