diff --git a/stepmania/src/RageTexture.h b/stepmania/src/RageTexture.h
index 296c95d1fe..7bf5e0e548 100644
--- a/stepmania/src/RageTexture.h
+++ b/stepmania/src/RageTexture.h
@@ -30,7 +30,8 @@ struct RageTextureID
 	bool bDither;
 	bool bStretch;
 
-	/* Define an ordering so this can be used in a set<>. */
+	/* Define an ordering so this can be used in a set<>.  This defines a partial
+	 * ordering; use equal() to see if they're equal. */
 	bool operator< (const RageTextureID &rhs) const	{ return filename < rhs.filename; }
 	bool equal(const RageTextureID &rhs) const;