diff --git a/tools/zipalign/README.txt b/tools/zipalign/README.txt
index 9c7d07e..0b80b35 100644
--- a/tools/zipalign/README.txt
+++ b/tools/zipalign/README.txt
@@ -5,6 +5,7 @@
 
   -c : check alignment only (does not modify file)
   -f : overwrite existing outfile.zip
+  -p : page align stored shared object files
   -v : verbose output
   <align> is in bytes, e.g. "4" provides 32-bit alignment
   infile.zip is an existing Zip archive
@@ -33,3 +34,7 @@
 
 You can use the "-c" flag to test whether a zip archive is properly aligned.
 
+The "-p" flag aligns any file with a ".so" extension, and which is stored
+uncompressed in the zip archive, to a 4096-byte page boundary.  This
+facilitates directly loading shared libraries from inside a zip archive.
+
diff --git a/tools/zipalign/ZipAlign.cpp b/tools/zipalign/ZipAlign.cpp
index 191dd41..a2dfd02 100644
--- a/tools/zipalign/ZipAlign.cpp
+++ b/tools/zipalign/ZipAlign.cpp
@@ -33,21 +33,21 @@
     fprintf(stderr, "Copyright (C) 2009 The Android Open Source Project\n\n");
     fprintf(stderr,
         "Usage: zipalign [-f] [-p] [-v] [-z] <align> infile.zip outfile.zip\n"
-        "       zipalign -c [-v] <align> infile.zip [list of files]\n\n" );
+        "       zipalign -c [-v] <align> infile.zip\n\n" );
     fprintf(stderr,
         "  <align>: alignment in bytes, e.g. '4' provides 32-bit alignment\n");
     fprintf(stderr, "  -c: check alignment only (does not modify file)\n");
     fprintf(stderr, "  -f: overwrite existing outfile.zip\n");
-    fprintf(stderr, "  -p: page align stored shared object: files\n");
+    fprintf(stderr, "  -p: page align stored shared object files\n");
     fprintf(stderr, "  -v: verbose output\n");
     fprintf(stderr, "  -z: recompress using Zopfli\n");
 }
 
-static const int kPageAlignment = 4096;
-
 static int getAlignment(bool pageAlignSharedLibs, int defaultAlignment,
     ZipEntry* pEntry) {
 
+    static const int kPageAlignment = 4096;
+
     if (!pageAlignSharedLibs) {
         return defaultAlignment;
     }