diff --git a/tools/hitag2crack/README.md b/tools/hitag2crack/README.md
index 9e9e722ef..cf6bffb8d 100644
--- a/tools/hitag2crack/README.md
+++ b/tools/hitag2crack/README.md
@@ -5,7 +5,7 @@ Authors:
 
 * Attacks 1, 2, 3, 4 : Kevin Sheldrake <kev@headhacking.com>
 * Attacks 5, 5gpu : anonymous, based on https://github.com/factoritbv/hitag2hell by FactorIT B.V.
-* Attacks 5, 5opencl : Gabriele Gristina <gabriele.gristina@gmail.com>, based on 5gpu
+* Attack  5opencl : Gabriele Gristina <gabriele.gristina@gmail.com>, based on 5gpu
 
 Introduction
 ------------
@@ -108,6 +108,12 @@ Attack 5gpu
 Attack 5gpu is identical to attack 5, simply the code has been ported to OpenCL
 to run on GPUs and is therefore much faster than attack 5.
 
+Attack 5opencl
+--------------
+
+Attack 5opencl is an optimized OpenCL version based on 5gpu.
+It runs on multi GPUs/CPUs and is faster than 5gpu.
+
 Usage details: Attack 1
 -----------------------
 
@@ -209,7 +215,7 @@ $ ./ht2crack5 <UID> <nR1> <aR1> <nR2> <aR2>
 Usage details: Attack 5gpu/5opencl
 ----------------------------------
 
-Attack 5gpu requires two encrypted nonce and challenge
+Attacks 5gpu and 5opencl require two encrypted nonce and challenge
 response value pairs (nR, aR) for the tag's UID.
 
 ```
@@ -221,13 +227,13 @@ Stop once you got two pairs.
 $ ./ht2crack5gpu <UID> <nR1> <aR1> <nR2> <aR2>
 ```
 
-Attack 5opencl requires the same of 5gpu version.
+or
 
 ```
 $ ./ht2crack5opencl <UID> <nR1> <aR1> <nR2> <aR2>
 ```
 
-More details in crack5opencl/README.md
+5opencl supports a number of additional parameters, see crack5opencl/README.md for details.
 
 Usage details: Next steps
 -------------------------
diff --git a/tools/hitag2crack/crack5opencl/README.md b/tools/hitag2crack/crack5opencl/README.md
index 3d5635b23..1b7d05455 100644
--- a/tools/hitag2crack/crack5opencl/README.md
+++ b/tools/hitag2crack/crack5opencl/README.md
@@ -26,10 +26,10 @@ encrypted nonces and challenge response values.  They should be in hex.
 
 UID is the UID of the tag that you used to gather the nR aR values.
 
-Following the help:
+Usage:
 
 ```
-$ ./ht2crack5opencl 
+$ ./ht2crack5opencl
 ./ht2crack5opencl [options] {UID} {nR1} {aR1} {nR2} {aR2}
 
 Options:
@@ -50,7 +50,7 @@ Example, select devices 1, 2 and 3 using platform 1 and 2, with random queue eng
 ./ht2crack5opencl -D 2 -Q 2 -p 1,2 -d 1,2,3 2ab12bf2 4B71E49D 6A606453 D79BD94B 16A2255B
 ```
 
-You can found the correct OpenCL Platform ID's (-p) and Device ID's (-d) by:
+You can find the correct OpenCL Platform ID (-p) and Device ID (-d) with:
 
 ```
 ./ht2crack5opencl -s