diff --git a/deodexerant/Main.c b/deodexerant/Main.c
index 45294b0f..4a03bdfc 100644
--- a/deodexerant/Main.c
+++ b/deodexerant/Main.c
@@ -642,7 +642,7 @@ int main(int argc, char* const argv[])
 		
 		if (clazz1 == NULL)
 		{
-		    fprintf(clientOut, "err: class %s could not be found for common superclass lookup\n", classType1);
+		    fprintf(clientOut, "err: class %s could not be found for common superclass lookup. This can be caused if a library the odex depends on is not in the BOOTCLASSPATH environment variable\n", classType1);
 		    fflush(clientOut);
 		    break;
 		}