diff --git a/lab1/README.md b/lab1/README.md
index d921da9ccd19cf0bfac66d306a9195f4c5c4dda3..951bad78af2cec5b11b55b9b783fe2ddbaab6fce 100644
--- a/lab1/README.md
+++ b/lab1/README.md
@@ -111,5 +111,12 @@ The solutions can be found in the [sol/ directory](sol/).
 
 # Acknowledgment
 
-The examples in this lab are provided for educational purposes by National Center for Supercomputing Applications, (in particular their Cyberinfrastructure Tutor), Lawrence Livermore National Laboratory and Argonne National Laboratory. Much of the LLNL MPI materials comes from the Cornell Theory Center. We would like to thank them for allowing us to develop the material for machines at PDC. You might find other useful educational materials at these sites.
+The examples in this lab are provided for educational purposes by 
+[National Center for Supercomputing Applications](http://www.ncsa.illinois.edu/), 
+(in particular their [Cyberinfrastructure Tutor](http://www.citutor.org/)), 
+[Lawrence Livermore National Laboratory](https://computing.llnl.gov/) and 
+[Argonne National Laboratory](http://www.mcs.anl.gov/). Much of the LLNL MPI materials comes from the 
+[Cornell Theory Center](http://www.cac.cornell.edu/). 
+We would like to thank them for allowing us to develop the material for machines at PDC. 
+You might find other useful educational materials at these sites.
 
diff --git a/lab2/README.md b/lab2/README.md
index 1666da779a7bcfda5c9c59d32a6c70e98fd0c815..e37ef58fb7e3a1a7ec0ecbcfe05224a6724ab559 100644
--- a/lab2/README.md
+++ b/lab2/README.md
@@ -68,4 +68,13 @@ The solutions can be found in the [sol/ directory](sol/).
 
 # Acknowledgment
 
-The examples in this lab are provided for educational purposes by National Center for Supercomputing Applications, (in particular their Cyberinfrastructure Tutor), Lawrence Livermore National Laboratory and Argonne National Laboratory. Much of the LLNL MPI materials comes from the Cornell Theory Center. We would like to thank them for allowing us to develop the material for machines at PDC. You might find other useful educational materials at these sites.
+The examples in this lab are provided for educational purposes by 
+[National Center for Supercomputing Applications](http://www.ncsa.illinois.edu/), 
+(in particular their [Cyberinfrastructure Tutor](http://www.citutor.org/)), 
+[Lawrence Livermore National Laboratory](https://computing.llnl.gov/) and 
+[Argonne National Laboratory](http://www.mcs.anl.gov/). Much of the LLNL MPI materials comes from the 
+[Cornell Theory Center](http://www.cac.cornell.edu/). 
+We would like to thank them for allowing us to develop the material for machines at PDC. 
+You might find other useful educational materials at these sites.
+
+
diff --git a/lab3/README.md b/lab3/README.md
index 51029a00386f2284a58ab3177233b9b96b02a8c6..130bf6886cc9486f87f0b3dfc8927ffd600ec4e8 100644
--- a/lab3/README.md
+++ b/lab3/README.md
@@ -75,4 +75,13 @@ Solutions are available in the [sol/ directory](sol/)
 
 # Acknowledgment
 
-The examples in this lab are provided for educational purposes by National Center for Supercomputing Applications, (in particular their Cyberinfrastructure Tutor), Lawrence Livermore National Laboratory and Argonne National Laboratory. Much of the LLNL MPI materials comes from the Cornell Theory Center. We would like to thank them for allowing us to develop the material for machines at PDC. You might find other useful educational materials at these sites.
+The examples in this lab are provided for educational purposes by 
+[National Center for Supercomputing Applications](http://www.ncsa.illinois.edu/), 
+(in particular their [Cyberinfrastructure Tutor](http://www.citutor.org/)), 
+[Lawrence Livermore National Laboratory](https://computing.llnl.gov/) and 
+[Argonne National Laboratory](http://www.mcs.anl.gov/). Much of the LLNL MPI materials comes from the 
+[Cornell Theory Center](http://www.cac.cornell.edu/). 
+We would like to thank them for allowing us to develop the material for machines at PDC. 
+You might find other useful educational materials at these sites.
+
+