diff --git a/c/gtk3/readme b/c/gtk3/readme
new file mode 100644
index 0000000..b996f14
--- /dev/null
+++ b/c/gtk3/readme
@@ -0,0 +1,2 @@
+GCC commandline to compile each example is:
+  gcc -lm `pkg-config --cflags --libs gtk+-3.0` *.c