diff --git a/Build-FAQ.md b/Build-FAQ.md
index 3360ae4..30a43e5 100644
--- a/Build-FAQ.md
+++ b/Build-FAQ.md
@@ -10,4 +10,14 @@ This issue is reported by [mruby/mruby#793](https://github.com/mruby/mruby/issue
 ## I got "Don't know how to rake"
 
 Maybe dependencies are corrupt. type ```./minirake clean```.
-Or ```git clean -xdf``` also effective.
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+Or ```git clean -xdf``` also effective.
+
+## I can't build with Android-NDK on Cygwin.
+
+Building on Cygwin is not well supported, because of the way paths are treated (slash vs. backslash, /cygdrive/c/ vs. C:\, etc.) However, some users successfully built under Cygwin.
+
+The key is to set up the NDK environment like so:
+
+```export ANDROID_STANDALONE_TOOLCHAIN=\`cygpath -w /tmp/android-14-toolchain\```
+
+After this, it should build if you run `make`.
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