diff --git a/glossary.md b/glossary.md
index 6c30587..136595c 100644
--- a/glossary.md
+++ b/glossary.md
@@ -165,6 +165,9 @@ Backgammon is one of the oldest known board games. It is a two player game where
 Foreground detection is one of the major tasks in the field of computer vision and image processing whose aim is to detect changes in image sequences. Background subtraction is any technique which allows an image's foreground to be extracted for further processing (object recognition etc.).
 
 ## backjumping
+
+**Backjumping** is a technique that reduces search space, therefore increasing efficiency. While backtracking always goes up one level in the search tree when all values for a variable have been tested, backjumping may go up more levels.
+
 ## backmarking
 ## backoff model
 ## backpropagation
@@ -177,6 +180,8 @@ A mathematical notation used to describe the syntax of a programming language.
 
 ## backward-chaining
 
+**Backward chaining** is the logical process of inferring unknown truths from known conclusions by moving backward from a solution to determine the initial conditions and rules.
+
 ## bag of words
 
 The **bag of words** model is a simplifying representation used in natural language processing and information retrieval. Also known as the vector space model. In this model, a text is represented as the bag of its words, disregarding grammar and even word order but keeping multiplicity.